allow link to be an error (#18)

Author: Dean Karn

chain.go

@@ -45,8 +45,7 @@ func (c Chain) Error() string {
 	return errFormatFn(c)
 }
 
-// Link contains a single error entry, unless it's the top level error, in
-// which case it only contains an array of errors
+// Link contains a single error entry contained in an error Chain.
 type Link struct {
 
 	// Err is the wrapped error, either the original or already wrapped
@@ -65,6 +64,11 @@ type Link struct {
 	Source runtimeext.Frame
 }
 
+// Error prints out a single Link in the Chains error.
+func (l *Link) Error() string {
+	return unsafeext.BytesToString(l.formatError(make([]byte, 0, 64)))
+}
+
 // formatError prints a single Links error
 func (l *Link) formatError(b []byte) []byte {
 	var funcName string

errors_test.go

@@ -167,6 +167,7 @@ func TestHasType(t *testing.T) {
 
 	for i, tc := range tests {
 		tc := tc
+		i := i
 		t.Run(tc.name, func(t *testing.T) {
 			t.Parallel()
 			if !HasType(tc.err, tc.typ) {

go.mod

@@ -3,6 +3,8 @@ module github.com/go-playground/errors/v5
 go 1.18
 
 require (
-	github.com/aws/aws-sdk-go v1.44.24
-	github.com/go-playground/pkg/v5 v5.0.0
+	github.com/aws/aws-sdk-go v1.44.244
+	github.com/go-playground/pkg/v5 v5.15.2
 )
+
+require github.com/jmespath/go-jmespath v0.4.0 // indirect

go.sum

@@ -1,21 +1,49 @@
 github.com/aws/aws-sdk-go v1.44.24 h1:3nOkwJBJLiGBmJKWp3z0utyXuBkxyGkRRwWjrTItJaY=
 github.com/aws/aws-sdk-go v1.44.24/go.mod h1:y4AeaBuwd2Lk+GepC1E9v0qOiTws0MIWAX4oIKwKHZo=
+github.com/aws/aws-sdk-go v1.44.244 h1:QzBWLD5HjZHdRZyTMTOWtD9Pobzf1n8/CeTJB4giXi0=
+github.com/aws/aws-sdk-go v1.44.244/go.mod h1:aVsgQcEevwlmQ7qHE9I3h+dtQgpqhFB+i8Phjh7fkwI=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/go-playground/assert v1.2.1/go.mod h1:Lgy+k19nOB/wQG/fVSQ7rra5qYugmytMQqvQ2dgjWn8=
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 github.com/go-playground/form/v4 v4.1.1/go.mod h1:q1a2BY+AQUUzhl6xA/6hBetay6dEIhMHjgvJiGo6K7U=
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 github.com/go-playground/pkg/v5 v5.0.0/go.mod h1:0380E0lsFB1POWFypOLL8tX2f0O1OBCBpSdVmEy4mg0=
+github.com/go-playground/pkg/v5 v5.15.2 h1:/PSAD9FTPd+pZ6dn22tCiKJGGCEbZMRXqkC/5bwvVBw=
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